| 摘要 |
An apparatus is provided for making waves in bodies of water used for swimming having a multicompartmented chamber with at least one set of separate paired compartments open in a nonintercommunicating lower portion for separate reception of water therewithin from a body of water, and closed in an intercommunicating upper portion in a manner to provide a fluid-tight upper portion confining therewithin a volume of fluid that is common to each pair of compartments; and at least one pair of pistons, each disposed in separate paired compartments in the chamber, each piston being mounted across its compartment for reciprocation in alternating power and suction strokes and arranged for fluid-pressure-induced interreaction with the other piston in balanced strokes; each piston having an upper face with a pressure-receiving surface responding to fluid pressure in the upper portion of its compartment, and a lower face with a pressure-receiving surface responding to water pressure in the lower portion of its compartment; whereby on the power stroke each piston pushes water below it in the lower portion of its compartment into its passage and via its port into the body of water, and on the suction stroke each piston draws water from its passage via its port into the lower portion of its compartment, the resulting alternating pulses of water flow generating waves in the body of water.
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